NC Bench
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Run: 2026-02-16-01KHKAT82FEEJ8MM4GNBH9PSJA
Run Details
Model:
GPT-5.2
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
19.8s
Cost:
$0.014730
Provider:
OpenAI
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain stitched silver threads across Blackmoor Pier as Inspector Lysa Hart arrived, summoned by an anonymous midnight telegram without warning. The lighthouse door hung open, breathing salt and kerosene, while gulls circled silently above the darkened waterline before dawn broke. Inside, the keeper lay slumped beside the ledger, throat neatly cut, hands still clutching a brass key warm with blood. No footprints marked the wet floor, yet a single candle burned, its flame steady as held breath in sealed air. Lysa noticed the telegram pinned to a nail, addressed in her father's handwriting, dated tomorrow, signed simply, Friend again here. From the tower stairs came a faint scrape, like someone retreating, and she drew her revolver, listening hard in darkness.
created_at
"2026-02-16T13:39:28.357458+00:00"
2/16/2026, 1:39:28 PM
model
"openai/gpt-5.2-20251211"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
5165
moderation_latency
(null)
generation_time
19634
tokens_prompt
46
tokens_completion
719
native_tokens_prompt
41
native_tokens_completion
1047
native_tokens_completion_images
0
native_tokens_reasoning
882
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"completed"
usage
0.01472975
router
(null)
provider_responses
0
id
"resp_0fc0ae3c4f52505b0169931dfc0e388197b4790fb07552efde"
status
200
is_byok
false
latency
194
endpoint_id
"f00142c2-6a93-49ce-9e36-5593b904ce3b"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.2-20251211"
api_type
"completions"
id
"gen-1771249147-DkrkCmRjewgvaPxMh5B6"
upstream_id
"resp_0fc0ae3c4f52505b0169931dfc0e388197b4790fb07552efde"
total_cost
0.01472975
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
100.0000%
Matches word count
n/a
neededClean
false
sentences
6
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20